Since books can now support hex colour formats, I believe it's possible to implement this into the program to produce colours more accurate to the image given.

I've also encountered a problem where my images on the book would be stretched vertically, I believe this is due to how line spacing on the Minecraft books creates more vertical space.

Perhaps there could be an optional switch to compensate for this stretch?
Deforming the source image in the program could fix the issue, however this would decrease the image quality especially for stuff like pixel art where the image is to-scale to begin with,
or parts of the image can be 'erased' according to where the line spaces occur, which would conserve quality at the loss of parts of the image being erased.

Hopefully you're still working on this project, I've found this really useful as the only tool capable of bringing images to Minecraft books!

Seemingly Paper servers believe books using these characters are part of some sort of item duplication hack or "ban book" hack, and auto-kick players who try to create them.

I understand this may not be a problem that BrailleBooks can really do anything about, and may just depend on Paper servers being smarter about checking for whether a book is part of some hack or just using unicode/wide characters like BrailleBooks does.

Steps to reproduce:

1. Run a papermc server with no plugins
2. Log in to the server with a minecraft client
3. try to paste this in to a written book on the server:
   §0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀§8⣤§7⡄§8⣀⡀§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀§7⢀§8⣤⣤⣿⣿⣿⣧⣤⡀§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀§7⢀⣀§8⣴⣿§7⣿⣿⣿⣿⣿§8⣿⣿⣿§7⡆§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀§8⠘⣿§7⣿⣿§8⡿⢿§7⣿⣿§8⣿§7⣿⣿⣿⣿§8⣄§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀§7⣾§8⣿⣿⢯§7⡄§0⠀§8⠉⠉§7⢡§8⣿⣿⡽§7⢿⣿§8⣧§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀§7⣿§0⠀§8⣏§7⠈§0⠀⠀§7⠶⣂⣀§8⣸⣿⡇§7⢠§8⡟⠁§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀§7⠘⢷⣭⣟§8⡟§7⠛§8⢻⣿§7⡉⠉⠙§8⣦⠞§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀§7⠈§8⡇§0⠀§7⠘§8⢿⡏§0⠀§8⣀⣼§7⣇§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀§8⣿⣶⣿⣿⣿⣿⣿⣿⣿§7⡄§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀§8⠹⣿⣿⠿⠿⠿⠿⠻⣿§7⡇§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀§8⣼⣿§7⠆§0⠀⠀⠀§7⢠§8⣿⠇§0⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
4. click "done" and be auto-kicked.

Versions:
BrailleBooks version 1.0
Papermc version paper-1.17.1-154
Minecraft Client: 1.17.1

Loading...
Resizing...

Unbehandelte Ausnahme: System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei BrailleBooks.Program.ResizeFrameList(List`1 frameList)
bei BrailleBooks.Program.Main(String[] args)